CN219311214U - Vertical long-distance conveying device for nuclear power station overhaul equipment and underwater overhaul system - Google Patents

Abstract

The utility model discloses a vertical long-distance conveying device of overhaul equipment of a nuclear power station and an underwater overhaul system. The conveying unit is of a vertical sectional splicing structure, is convenient to install and transport, and can meet the transportation requirements of the inside and outside of a nuclear power station factory and the limited field requirements of a nuclear power station maintenance factory; the rack unit can be spliced on the conveying unit in a multi-section mode, assembly and transportation are convenient, long-distance transmission requirements can be met, and the rack unit has higher transmission precision, so that overhaul equipment has higher positioning precision on the conveying unit.

Description

Vertical long-distance conveying device for nuclear power station overhaul equipment and underwater overhaul system

Technical Field

The utility model relates to the technical field of nuclear power overhaul, in particular to a vertical long-distance conveying device for nuclear power station overhaul equipment and an underwater overhaul system.

Background

When the nuclear island of the nuclear power station is in emergency maintenance of the main equipment in service, fixing bolts, pins and the like on the equipment are required to be disassembled and assembled, the radiation influence of the main equipment in service is required, the maintenance process is required to be carried out in a component pool (in shielding water) in the whole course, and related operation is carried out by personnel directly approaching, so that the maintenance process has health risks. The inventor makes the improvement, is that the maintenance equipment is transported to the underwater working position in the component pool through the long-distance conveying device, and the underwater maintenance work is carried out through remote control of the maintenance equipment, so that the influence of radiation on personnel is reduced.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a vertical long-distance conveying device for nuclear power station overhaul equipment and an underwater overhaul system.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a vertical long distance conveyor of nuclear power station maintenance equipment, vertical long distance conveyor of nuclear power station maintenance equipment is including installing at the work platform at lower part heap internals top, a plurality of install work platform's one side is just along the vertical conveying unit who meets in proper order, every conveying unit includes a plurality of rack units that are used for carrying maintenance equipment, and meet in proper order vertically.

Preferably, each conveying unit further comprises a plurality of linear guide rail units which are vertically connected in sequence, and the overhaul equipment is in sliding fit with the linear guide rail units.

Preferably, each of the conveying units includes a main body extending vertically and disposed in parallel and opposite to each other, a connection plate connected between the main bodies in a lateral direction, and the rack unit and the linear guide unit are disposed on the main bodies.

Preferably, the main body is provided with a reference plate extending vertically, and the rack unit and the linear guide rail unit are respectively connected to the main body through the reference plate.

Preferably, the reference plate comprises a first reference plate for connecting the rack unit and a second reference plate for connecting the linear guide rail unit, and the first reference plate and the second reference plate are arranged relatively vertically.

Preferably, the main body is an aluminum profile.

Preferably, the vertical long-distance conveying device of the overhaul equipment of the nuclear power station further comprises a mounting assembly arranged on one side of the working platform, the mounting assembly comprises a supporting plate and a supporting piece arranged on the supporting plate, a clamping groove is formed in the supporting piece, and the connecting plate can be inserted and matched in the clamping groove.

Preferably, the mounting assembly further comprises a limiting piece arranged on the supporting plate, and the limiting piece is arranged on one side of the supporting piece and is abutted with the conveying unit.

Preferably, a positioning pin is arranged on one side of the working platform, and a pin sleeve corresponding to the positioning pin is arranged on at least one conveying unit.

Preferably, the number of the conveying units is three, and the conveying units are respectively a top section unit, a middle section unit and a bottom section unit which are sequentially connected from top to bottom, and the top section unit is provided with a pin sleeve corresponding to the positioning pin.

Preferably, a spherical hinge support is arranged at the bottom of the bottom section unit, and the bottom section unit is supported at the bottom of the component pool where the lower internal pile components are located through the spherical hinge support.

The utility model also provides an underwater maintenance system, which comprises the vertical long-distance conveying device of the maintenance equipment of the nuclear power station and the maintenance equipment;

the overhaul equipment comprises a conveying platform in transmission connection with the rack unit, and underwater screwing equipment or underwater welding equipment arranged on the conveying platform.

The utility model has at least the following beneficial effects:

the conveying unit is of a vertical sectional splicing structure, is convenient to install and transport, and can meet the transportation requirements of the inside and outside of a nuclear power station plant and the limited field requirements of a nuclear power station maintenance factory (AC); the rack unit can be spliced on the conveying unit in a multi-section mode, assembly and transportation are convenient, long-distance transmission requirements can be met, and the rack unit has higher transmission precision, so that overhaul equipment has higher positioning precision on the conveying unit.

The underwater screwing equipment or the underwater welding equipment is transported to the underwater environment in the component pool through the conveying platform, so that the remote control overhaul equipment can perform underwater screwing or welding work on a target workpiece, and the harm of absorption of excessive radiation due to close-range operation of personnel is reduced.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic structural view of a vertical long-distance transportation device for nuclear power plant overhaul equipment according to an embodiment of the present utility model;

FIG. 2 is a nuclear power plant service facility according to an embodiment of the present utility model a conveying unit structure schematic diagram of the vertical long-distance conveying device;

FIG. 3 is a schematic view of a mounting assembly of a vertical long-distance transport device for nuclear power plant maintenance equipment according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the structure of a top section unit of a vertical long distance transport device for nuclear power plant maintenance equipment according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a structure of a middle unit of a vertical long distance transport device for nuclear power plant maintenance equipment according to an embodiment of the present utility model;

FIG. 6 is a schematic view of the structure of a bottom section unit of a vertical long distance transport device for nuclear power plant maintenance equipment according to an embodiment of the present utility model;

FIG. 7 is an enlarged schematic view of portion A of FIG. 6;

FIG. 8 is a schematic view of a stage in the installation of a vertical long-distance transport device for nuclear power plant maintenance equipment according to an embodiment of the present utility model;

FIG. 9 is a schematic illustration of a stage in the installation of a vertical long-distance transport device for nuclear power plant service equipment according to one embodiment of the present utility model;

FIG. 10 is a schematic view of a stage in the installation of a vertical long-distance transport device for nuclear power plant maintenance equipment according to an embodiment of the present utility model;

FIG. 11 is a schematic view of the underwater screw-in device of the underwater maintenance system according to an embodiment of the present utility model;

FIG. 12 is a vertical cross-sectional view of an underwater welding apparatus of an underwater service system according to an embodiment of the present utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.

The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features.

The term "vertical" or "vertical" as used herein refers to a direction parallel to the length direction of the lower in-pile member 5 placed in the member pool, and the term "lateral" as used herein refers to a direction perpendicular to the term "vertical" or "vertical".

As shown in fig. 1-2, the vertical long-distance transport device for overhaul equipment of a nuclear power plant according to an embodiment of the present utility model includes a working platform 1 installed on top of a lower internals 5, and a plurality of transport units 2 vertically installed on one side of the working platform 1 and vertically connected in sequence, each transport unit 2 including a plurality of rack units 206 for transporting the overhaul equipment 3 and vertically connected in sequence.

The work platform 1 may be a welded-in stainless steel structure, the work platform 1 comprising at least one layer of shielding plate, which may be a lead plate, for shielding radiation coming out from the lower internals 5.

The working platform 1 is provided with a positioning key groove 11, the lower internal pile member 5 is provided with a corresponding pin shaft 12, and the working platform 1 can be positioned and installed on the top of the lower internal pile member 5 through the cooperation of the pin shaft 12 and the positioning key groove 11. The working platform 1 is also provided with an anti-tipping hook 13, and the anti-tipping hook 13 hooks the edge of the lower internal pile member 5, so that the working platform 1 can be prevented from tipping due to uneven stress caused by the installation of the conveying unit 2 on one side of the working platform. The working platform 1 is also provided with a guardrail 14. A person can stand on the work platform 1 for relevant auxiliary operations.

The overhauling equipment 3 is in transmission connection with the rack unit 206, and can be vertically conveyed to a certain working position (such as an irradiation sample bracket) on the outer surface of the lower internal pile member 5 below the water level in the member pool (for example, below the water level of +19.5m in fig. 1) to perform disassembly work of fixing bolts, pins and the like. The conveying units 2 are of vertical sectional splicing structures, each conveying unit 2 can be directly lifted into the component pool through the lifting mechanism to be vertically and sequentially assembled, so that the installation and the transportation are convenient, and the transportation requirements of the inside and the outside of the nuclear power plant and the limited field requirements of a maintenance factory (AC) of the nuclear power plant can be met.

Meanwhile, the rack unit 206 can be spliced on one conveying unit 2 in a multi-section manner, so that the assembly and the transportation are convenient, the requirement of long-distance transmission can be met, and the high transmission precision is realized, so that the overhaul equipment 3 has high positioning precision on the conveying unit 2.

Further, in some embodiments, each of the conveying units 2 further includes a plurality of vertically sequentially connected linear guide rail units 205, and the service apparatus 3 is slidably engaged with the linear guide rail units 205. The linear guide rail unit 205 further provides linear guide for the vertical conveying movement of the overhaul equipment 3, and is matched with the rack unit 206, so that the vertical conveying movement of the overhaul equipment 3 has higher movement precision and movement stability.

Further, each of the conveying units 2 includes a main body 201 extending vertically and disposed oppositely in parallel, a connection plate 202 connected laterally between the main bodies 201, and a rack unit 206 and a linear guide rail unit 205 are disposed on the main body 201.

The main body 201 is of a groove structure, and the plurality of connecting plates 202 are vertically distributed between the main bodies 201 at intervals, and as shown in the figure, each conveying unit 2 is generally in a ladder shape as a whole. Of the plurality of connection plates 202, a first connection plate 202 positioned at the edge can be used as a lifting plate 203, and the shape of the edge of the lifting plate 203 can be set corresponding to a lifting mechanism, so that the lifting mechanism is convenient to be matched and connected with the lifting plate 203.

Further, a reference plate extending in the vertical direction is mounted on the main body 201, and the rack unit 206 and the linear guide rail unit 205 are connected to the main body 201 through the reference plate, respectively.

Specifically, the reference plate is fixed to the main body 201 by screws, enhancing reliability of connection between the rack unit 206 and the linear guide unit 205 and the main body 201, and flatness of the rack unit 206 and the linear guide unit 205 mounted to the main body 201 can be adjusted by the reference plate.

Further, the reference plates include a first reference plate 208 for connecting the rack unit 206 and a second reference plate 204 for connecting the linear guide rail unit 205, and the first reference plate 208 and the second reference plate 204 are disposed relatively vertically.

Specifically, as shown in fig. 2, the first reference plates 208 are located on one of opposite inner side surfaces of the main body 201, and the two sets of the second reference plates 204 are located on the other two surfaces of the main body 201, respectively. By adjusting the screws for assembly and trimming, the vertical relative position relationship between the first reference plate 208 and the second reference plate 204 can be accurately adjusted, so that the linear guide rail unit 205 and the rack unit 206 are positioned on different planes, and the stability of the movable fit connection between the conveying unit 2 and the overhaul equipment 3 is enhanced.

Further, the main body 201 is an aluminum profile. The aluminum profile is selected as the material of the main body 201, so that the aluminum profile has certain strength, the structural weight of the main body 201 can be reasonably controlled while the supporting function is met, and the working pressure of the conveying unit 2 on the bottom of a nuclear island factory building (RX) component pool of the nuclear power station is kept within the allowable pressure range of the pool bottom.

Further, as shown in fig. 3, the vertical long-distance conveying device for the overhaul equipment of the nuclear power plant further comprises a mounting assembly arranged on one side of the working platform 1, the mounting assembly comprises a supporting plate 32 and a supporting piece 4 arranged on the supporting plate 32, a clamping groove 31 is formed in the supporting piece 4, and a connecting plate 202 of the conveying unit 2 can be inserted and matched in the clamping groove 31.

Further, the installation component still includes setting up the locating part 33 on backup pad 32, and the locating part 33 sets up in one side of support piece 4 and with conveying unit 2 butt, prevents that conveying unit 2 from rocking in the equipment in-process and producing offset and slope, guarantees that the conveying unit 2 that falls at the installation component is in relative vertical gesture, makes things convenient for wearing to sell to counterpoint and carry out flange joint between each conveying unit 2.

Corresponding to the lifting mode of the installation component, the installation component can further comprise a lifting rod 35, the lifting rod 35 is provided with a lifting ring 36 for being matched with lifting, and the lifting ring 36 is in threaded connection with the lifting rod 35. When the lifting device is required to be used, the lifting ring 36 is mounted on the lifting rod 35, the lifting ring 36 is matched with the lifting mechanism to realize lifting of the mounting assembly, and the lifting ring 36 can be taken down after the mounting is completed.

Specifically, in the lifting and assembling stage, the connecting plate 202 is matched with the clamping groove 31 on the supporting piece 4, meanwhile, one conveying unit can be temporarily fixed on one side of the working platform 1, after being spliced with another conveying unit, the other conveying unit is fixed on one side of the working platform 1, so that the cycle is performed, the vertical assembling of each conveying unit 2 can be smoothly completed, and meanwhile, the assembled combination gradually moves to one side close to the inside of the component pool until the conveying unit at the bottommost end is lowered to the pool bottom of the component pool (for example, the elevation +7.5m in fig. 1).

Further, in some embodiments, a positioning pin 10 is provided on one side of the working platform 1, and a pin sleeve 207 corresponding to the positioning pin 10 is provided on at least one conveying unit 2. One side of the working platform 1 is provided with a mounting platform 15 extending in the horizontal direction, and the positioning pin 10 and the mounting assembly are arranged on the mounting platform 15.

Correspondingly, the supporting plate 32 is also provided with a pin bush 34 which can be sleeved with the positioning pin 10 on the working platform 1 so as to mount the mounting assembly on the mounting platform 15 on one side of the working platform 1.

Further, in some embodiments, as shown in fig. 4-6, the number of the conveying units 2 is three, and the conveying units may be a top section unit 20, a middle section unit 30, and a bottom section unit 40 sequentially connected from top to bottom, where a pin sleeve 207 corresponding to the positioning pin 10 is disposed on a main body 201 of the top section unit 20.

Specifically, the main body 201 of the top stage unit 20 is fitted with its pin bush 207 with the positioning pin 10 to fix the main body 201 of the top stage unit 20 to the mounting platform 15. The middle section unit 30 and the bottom section unit 40 are not provided with pin sleeves, but are clamped on the clamping groove 31 of the mounting assembly by the connecting plate 202, and are limited by the limiting piece 33 so as to be temporarily fixed on one side of the working platform 1 in the assembly stage.

It will be appreciated that, according to different field conditions, in other embodiments, the pin sleeves 207 corresponding to the positioning pins 10 may be disposed on the middle section unit 30 and the bottom section unit 40, and the middle section unit 30 and the bottom section unit 40 may be temporarily fixed on one side of the working platform 1 through the positioning pins 10 during the assembly stage, so as to avoid the installation assembly.

The joints of the top section unit 20, the middle section unit 30 and the bottom section unit 40 can be flange joints. As shown in fig. 5-7, taking the connection between the bottom section unit 40 and the middle section unit 30 as an example, in fig. 5, the bottom of the middle section unit 30 has a connection base 211, and a positioning pin 209 is provided on the connection base 211 in a protruding manner. In fig. 6-7, the bottom section unit 40 has a top connecting plate 212, and the top connecting plate 212 has a pin hole 210. Meanwhile, a screw 214 and a bolt 213 are also provided on the connection top plate 212. During assembly, the connecting bottom plate 211 of the middle section unit 30 is aligned with the screw 214 on the connecting top plate 212 of the bottom section unit 40 by the U-shaped groove, and meanwhile, the positioning pin 209 is inserted into the pin hole 210, so that the connecting bottom plate 211 of the middle section unit 30 is positioned and attached with the connecting top plate 212 of the bottom section unit 40, and the bottom section unit 40 and the middle section unit 30 can be connected by the locking bolt 213. Obviously, the connection between the top section unit 20 and the middle section unit 30 can be achieved in the same way.

Further, as shown in fig. 6, the bottom of the bottom section unit 40 is provided with a spherical hinge bracket 401, and the bottom section unit 40 is supported at the bottom of the component pool where the lower in-pile component 5 is located by the spherical hinge bracket 401.

Specifically, referring to fig. 8 to 10 together, the installation process of the vertical long-distance conveying device for the overhaul equipment of the nuclear power station according to an embodiment of the present utility model is as follows:

s1, mounting a working platform 1 on the top of a lower internal pile member 5;

s2, mounting a mounting assembly on the mounting platform 15;

s3, lifting the bottom section unit 40, aligning and inserting the connecting plate 202 of the bottom section unit 40 onto the clamping groove 31 of the supporting piece 4, and fixing the bottom section unit 40 on one side of the working platform 1 (after installation is finished, as shown in FIG. 8);

s4, lifting the middle section unit 30, wherein the bottom of the middle section unit 30 is connected with the top flange of the bottom section unit 40 to obtain a first combination body composed of the middle section unit 30 and the bottom section unit 40;

s5, lifting the first combined body, enabling the connecting plate 202 of the bottom section unit 40 to leave the clamping groove 31 of the supporting piece 4, inserting the connecting plate 202 of the middle section unit 30 into the clamping groove 31 of the supporting piece 4, and enabling the first combined body to move downwards for a certain distance into the component pool (after installation is completed, as shown in FIG. 9);

s6, lifting the top section unit 20, wherein the bottom of the top section unit 20 is connected with the top flange of the middle section unit 30 to obtain a second combination body consisting of the top section unit 20, the middle section unit 30 and the bottom section unit 40;

s7, enabling the connecting plate 202 of the middle section unit 30 to leave the clamping groove 31 of the supporting piece 4, enabling the second combination body to move downwards to a component pool for a certain distance, sleeving the pin sleeve 207 of the top section unit 20 on the positioning pin of the mounting platform 15 for fixing (after the mounting is finished, as shown in FIG. 10);

s8, locking the joint of the second combination body, and adjusting the perpendicularity of the second combination body.

Further, in step S7, after the connection plate 202 of the middle unit 30 is separated from the clamping groove 31 of the support 4, the mounting assembly may be removed.

The underwater overhaul system provided by the utility model comprises the vertical long-distance conveying device for the overhaul equipment of the nuclear power station and the overhaul equipment;

the overhaul equipment 3 comprises a conveying platform in transmission connection with the rack unit, and an underwater screwing device or an underwater welding device arranged on the conveying platform. As shown in fig. 1, the service apparatus 3 further includes a camera 31 for feeding back image information to assist positioning.

Specifically, a gear (not shown) is arranged at the joint of the conveying platform and the rack unit, and is in transmission connection with the rack unit to drive the conveying platform to move up and down. A locking member (not shown) for controlling the locking of the movement may also be provided at the connection of the rack unit and the gear wheel.

As shown in fig. 11, the underwater screwing device may include a support frame 60, a watertight motor mechanism;

the watertight motor mechanism comprises a watertight housing 61, a hall-free direct-current brushless motor (not shown), a rotary wrench 62, a torque sensor (not shown) for detecting the torque, and a rotary transformer (not shown) for monitoring a rotor rotation signal of the hall-free direct-current brushless motor;

the watertight housing 61 is connected with the support frame 60 so as to be limited in the support frame 60, the Hall-free direct current brushless motor, the torque sensor and the rotary transformer are contained in the watertight housing 61, the rotary wrench 62 is connected to the front end portion of the watertight housing 61, the Hall-free direct current brushless motor is connected with one end of the rotary wrench 62 and drives the rotary wrench 62 to rotate, and the opposite end of the rotary wrench 62 is coaxially matched with a piece to be screwed so as to drive the piece to be screwed to coaxially rotate. The parts to be screwed may be fixing bolts, pins or the like on the lower internals 5.

The underwater screwing equipment is transported to an underwater environment through a conveying platform, a rotary wrench 62 of the underwater screwing equipment is aligned to a target part to be screwed by matching with the camera 31, and the screwing action of the equipment is started.

Corresponding to the arrangement of the brushless DC motor without Hall, a rotary transformer is selected for feeding back the rotation signal of the rotor of the brushless DC motor without Hall to a control system (not shown), so as to realize synchronous follow-up of the brushless direct current motor without the Hall. The torque sensor is matched with the control system, so that the torque output by the brushless motor can be accurately controlled.

The preferred model of the brushless Hall motor is a YFL129-7119 type frameless torque motor. The preferred resolver model is polymomon TS2620N21E11; the preferred torque sensor model is a gold JNNT-F-1000 dual flange static torque sensor.

As shown in fig. 12, the underwater welding apparatus may include a waterproof cover 70, a welding gun 71, a motor 72;

the water shield 70 includes opposite air passage interface and open ends; the welding gun 71 faces the opening end of the waterproof cover 70 with the gun head facing the opening end of the waterproof cover 70 and is tightly matched in the waterproof cover 70, a waterproof area 73 positioned between the welding gun 71 and the air passage interface end of the waterproof cover 70 and a drainage area 74 positioned between the welding gun 71 and the opening end of the waterproof cover 70 are isolated in the waterproof cover 70;

the motor 72 is arranged in the water-proof area 73 and is in transmission connection with the eccentric shaft of the welding gun 71 by the output shaft thereof;

the welding gun 71 is provided with an inner air passage penetrating to the gun head thereof, and the air passage interface end of the water-proof cover 70 is sequentially communicated with the water-proof area 73, the inner air passage and the water draining area 74, and is used for introducing inert gas and filling the water draining area 74 with the inert gas.

The underwater welding equipment is transported to the underwater environment through the conveying platform, and is aligned to a target workpiece to be welded (such as the end face of the locating pin) in cooperation with the camera 31. The inert gas is continuously filled into the gas path interface end of the waterproof cover 70, so that water cannot enter the water draining area 74 while the protective gas environment is provided for welding, and a local dry environment for isolating water is provided for welding operation of the welding gun 71, so that corresponding welding operation is performed.

The foregoing description of the utility model should not be taken as limiting the scope of the utility model, but rather should be understood to cover all modifications, variations and alternatives of the utility model, as may be apparent to those skilled in the art, or may be resorted to, falling within the scope of the utility model as defined by the appended claims.

Claims (12)

1. The utility model provides a vertical long distance conveyor of nuclear power station maintenance equipment, its characterized in that, the vertical long distance conveyor of nuclear power station maintenance equipment is including installing work platform (1) at lower part heap internals (5) top, a plurality of install one side of work platform (1) and along conveying unit (2) that meet in proper order vertically, every conveying unit (2) include a plurality of rack units (206) that are used for carrying maintenance equipment (3), and meet in proper order vertically.

2. The vertical long-distance conveying device for overhauling equipment of a nuclear power plant according to claim 1, wherein each conveying unit (2) further comprises a plurality of linear guide rail units (205) which are vertically connected in sequence, and the overhauling equipment (3) is slidably matched with the linear guide rail units (205).

3. The nuclear power plant overhaul equipment vertical long-distance transport apparatus according to claim 2, characterized in that each of the transport units (2) includes a main body (201) extending vertically and disposed in parallel opposition, a connection plate (202) connected laterally between the main bodies (201), and the rack unit (206) and the linear guide rail unit (205) are disposed on the main bodies (201).

4. A plant overhaul equipment vertical long distance transport device according to claim 3, characterized in that the main body (201) is mounted with a reference plate extending vertically, and the rack unit (206) and the linear guide unit (205) are connected to the main body (201) by means of the reference plate, respectively.

5. The nuclear power plant overhaul equipment vertical long-distance transport apparatus according to claim 4, wherein the reference plates include a first reference plate (208) for connecting a rack unit (206) and a second reference plate (204) for connecting a linear guide unit (205), the first reference plate (208) and the second reference plate (204) being disposed relatively vertically.

6. A plant overhaul equipment vertical long distance transport device according to claim 3, characterized in that the main body (201) is an aluminium profile.

7. A vertical long distance transport device for nuclear power plant maintenance equipment according to claim 3, further comprising a mounting assembly arranged on one side of the working platform (1), wherein the mounting assembly comprises a support plate (32), a support member (4) arranged on the support plate (32), a clamping groove is arranged on the support member (4), and the connecting plate (202) can be inserted and matched in the clamping groove.

8. The vertical long-distance transportation device of nuclear power plant overhaul equipment according to claim 7, characterized in that the installation assembly further comprises a limiting piece (33) arranged on the supporting plate (32), wherein the limiting piece (33) is arranged on one side of the supporting piece (4) and is abutted with the transportation unit (2).

9. The vertical long-distance conveying device for nuclear power plant overhaul equipment according to any one of claims 1 to 8, wherein a positioning pin (10) is arranged on one side of the working platform (1), and a pin bush (207) corresponding to the positioning pin (10) is arranged on at least one conveying unit (2).

10. The vertical long-distance conveying device for nuclear power station overhaul equipment according to claim 9, wherein the number of the conveying units (2) is three, namely a top section unit (20), a middle section unit (30) and a bottom section unit (40) which are sequentially connected from top to bottom, and pin sleeves (207) corresponding to the positioning pins (10) are arranged on the top section unit (20).

11. The vertical long-distance conveying device for nuclear power plant overhaul equipment according to claim 10, wherein a spherical hinge support (401) is arranged at the bottom of the bottom section unit (40), and the bottom section unit (40) is supported at the bottom of a component pool where the lower internal pile component (5) is located through the spherical hinge support (401).

12. An underwater service system, characterized by comprising a vertical long-distance transport device of service equipment of a nuclear power plant as claimed in any one of claims 1-11, and service equipment (3);

the overhaul equipment (3) comprises a conveying platform in transmission connection with the rack unit (206), and an underwater screwing device or an underwater welding device arranged on the conveying platform.

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